BASIC SURVEYING KNOWLEDGE FOR HIGH DEFINITION SCANNING

Steven Rames, PE/LSSeptember 12, 2013

BACKGROUND KNOWLEDGE TO HDS

Youtube Video

Equipment• Levels (Dumpy, Auto, Digital)• Transit• Theodolite• EDM – Electronic Distance Measurement• Total Station• GPS – Global Positioning System• LiDAR – Light Detection and Ranging• HDS - High Definition Scanning• Photogrammetry.

Misc. Equipment

Equipment - Levels

Equipment – Transit/Total Station

Equipment - Modern

Examples

Datum(s)

• Horizontal/Vertical–Assumed–Local–Building Based–Geodetic–ECEF–National

Datums - Examples

• Horizontal– Latitude, Longitude– NAD 27– NAD 83– 0,0– 1000.00,10,000.00– State Plane Coordinates– UTM– NTRS

• Vertical– Sea Level– NAVD29– NGVD88– GRAVD– Geoid– Ellipsoid– Ground/Floor– 100.00

Control

• System of horizontal and vertical positions with know accuracy

HDS Uses

• Forensics• Architecture• Engineering• Historical Preservation• Science/Exploration• Construction• Surveying• Utilities Management

• Static• Mobil• Airborn• Hydrographic• Ground Penetrating

Methods of HDS

Surevey Exercises

• Horizontal Measurement– Chaining

• Plumbing• Sag• Thermal

– Cloth Tape– Pacing

• Leveling– Notes

• Angles

Leveling

Questions

• Sag – 30 Lbs Pull offset the sag in a 100.00’ chain

• Thermal ChangeC=0.00000645(T-68)100